Determining the support capacity based on roof and coal wall control.

In order to resolve the control problems of the roof and rib of high efficient longwall workface, on the basis of site investigation and theoretical research, this paper introduced the development of support capacity in mining work face and basic methods to determine support capacity at home and abroad. It also pointed out that these methods take roof load control as the starting point. In order to achieve high efficient mining, resistance of the roof load and binary criterion of shield support capacity determination were established. The conclusion that roof pressure is the main factor to affect rib stability was obtained by analyzing effect of roof pressure to rib stability and effect of support capacity to reducing rib pressure, therefore it proposed conforming criteria of support capacity with keeping coal rib stability. The roof will impact shield support when main roof structure is instability, according to this, calculation method of dynamic load that depends on calculating support capacity to control roof is presented in this paper. [ABSTRACT FROM AUTHOR]